Category Archives: Cisco

802.1Q Trunking Between Cisco and Dell Force10 Switches

Posted on July 2, 2012 by Humair

In this lab I use a Dell Force10 S25P switch [FTOS 8.4.2.6] and a Cisco C3750 switch [IOS 12.2(25)SEE3] to demonstrate 802.1Q trunking.

Posted in Cisco, Dell Force10, Force10 Networks, Labs, Networking, Protocols, Technology | Tagged 802.1q, 802.1Q encapsulation, 802.1Q trunk, 802.1Q trunking, change default vlan, change native vlan, Cisco, Cisco C3750, default vlan, Dell Force10, Dell Force10 S25P, dot1q, etherchannel, Force10, hybrid, hybrid port, IEEE 802.1Q, Inter-Switch Link, isl, native, trunk, trunk encapsulation, Trunking, vlan, vlans, Voice over Internet Protocol, VOIP | 17 Comments

EIGRP – Advertising a Default Route to Neighbors

Posted on June 28, 2012 by Humair

In this lab I use five Cisco 7200 routers [IOS 12.4(24)T] to demonstrate how to advertise a default route to neighbors in EIGRP. Below is the network diagram for this lab.

Posted in Cisco, Labs, Networking, Protocols, Technology | Tagged advertise a default route to EIGRP neighbors, advertise default route to neighbors, Cisco 7200, Cisco 7200 router, default route, default-network, EIGRP, Enhanced Interior Gateway Routing Protocol, ip default-network | Leave a comment

Configuring eBGP Peers to Use a Loopback Interface

Posted on June 13, 2012 by Humair

In this lab, I use two Cisco 3725 routers [IOS 12.4(15)T10] to configure eBGP peers using loopback interfaces. Below is the network diagram for this lab.

Posted in Cisco, Labs, Networking, Protocols, Technology | Tagged BGP, BGP neighbor, BGP neighbors, BGP peers, Border Gateway Protocol, Cisco, Cisco 3725, Cisco 3725 router, cisco router, Configuring BGP, eBGP, eBGP peers, peers | 1 Comment

Configuring OSPF with Multiple Areas

Posted on June 1, 2012 by Humair

In this lab, I use three Cisco 3725 routers [IOS 12.4(15)T10] to demonstrate how to setup OSPF with multiple Areas. Below is the network diagram for this lab.

Posted in Cisco, Labs, Networking, Protocols, Technology, Troubleshooting | Tagged Area, Areas, Cisco, Cisco 3725, Cisco 3725 router, Multiple Areas, Multiple OSPF Areas, OSPF, OSPF area, OSPF Areas, router | Leave a comment

Networking: Blocking Access to a Website via Extended Access List [Video]

Posted on April 16, 2012 by Humair

This video demonstrates how to use an extended access list to prevent specific hosts from accessing a website. In this lab I use two Cisco 2811 routers [IOS 12.4(15)T1] and two Cisco 2950-24 switches [IOS 12.1(22)EA4].

Posted in Cisco, Labs, Networking, Technology | Tagged ACL, Cisco 2811, Cisco 2811 router, Cisco 2950, Cisco 2950-24, Cisco 2950-24 switch, Cisco switch, extended access list, Extended ACL, prevent hosts from accessing a website, prevent specific hosts from accessing a website, router | Leave a comment

EIGRP – Best Path Selection

Posted on March 27, 2012 by Humair

By default EIGRP uses bandwidth and delay of the line to determine the best path to a remote network. However, if desired, EIGRP can use a composite of four metrics: bandwidth, delay, reliability, and load. Maximum transmission unit (MTU) is … Continue reading →

Posted in Cisco, Labs, Networking, Protocols | Tagged bandwidth, Cisco, Cisco 3725, Cisco 3725 router, Cisco 3725 routers, delay, delay of the line, EIGRP, EIGRP calculation, eigrp load balancing, Enhanced Interior Gateway Routing Protocol, equal cost load balancing, load balancing, router, routing table, topology table | Leave a comment

Setting-up Basic iBGP and eBGP on Cisco Routers

Posted on March 15, 2012 by Humair

The Border Gateway Protocol (BGP) is a protocol used to make core routing decisions on the Internet. BGP is commonly mislabeled or referred to as an IP routing protocol. However, it is not a routing protocol; rather, it is a … Continue reading →

Posted in Cisco, Networking, Protocols, Technology | Tagged AS, Autonomous Number, Autonomous Numbers, BGP, BGP table, Border Gateway Protocol, Cisco, Cisco 3725, Cisco 3725 router, eBGP, established, established state, External BGP, iBGP, Internal BGP, Multihomed, neighbor, neighbor relationship, Neighbors, ping, prefxes, redistribute connected, redistribute static, redistribution of static and connected routes into BGP, show ip bgp, show ip bgp summary, state | Leave a comment

EIGRP and OSPF Redistribution on Cisco Routers

Posted on February 7, 2012 by Humair

This was a quick lab I threw together which I thought was pretty cool. In this lab I use five Cisco 3725 routers [IOS 12.4(15)T10] in which I have two groups of routers each on a different subnet and running … Continue reading →

Posted in Cisco, Labs, Networking, Protocols, Technology | Tagged Cisco, Cisco 3725, Cisco 3725 router, cisco router, EIGRP and OSPF Redistribution, EIGRP Redistribution, EIRGP, OSPF, Redistribution, router | Leave a comment

Setup and Troubleshoot EIGRP

Posted on February 2, 2012 by Humair

I discussed Enhanced Interior Gateway Routing Protocol (EIGRP) briefly in a prior blog, Load Balancing with EIGRP, however, in this lab I use two Cisco 3725 routers [IOS 12.4(15)T10] to demonstrate how to configure EIGRP; additionally, I’ll discuss some useful … Continue reading →

Posted in Cisco, Labs, Networking, Protocols, Technology, Troubleshooting | Tagged Cisco, Cisco 3725, Cisco 3725 router, Cisco 3725 routers, dynamic routing, EIGRP, Enhanced Interior Gateway Routing Protocol, router | Leave a comment

Configuring PVST+ on Cisco Switches

Posted on February 1, 2012 by Humair

Per VLAN Spanning Tree Plus (PVST+) is a flavor of Spanning Tree Protocol (see prior blog, Default STP Behavior on Cisco Switches) which maintains a spanning tree instance for each VLAN in the network. This means certain VLAN trunks (using … Continue reading →

Posted in Cisco, Labs, Networking, Protocols, Technology | Tagged avoid loop, Cisco, Cisco 3560, Cisco 3560 switch, Cisco switch, dot1q, loop, Per VLAN Spanning Tree Plus, prevent loop, PVST+, Spanning Tree Protocol, STP, switch, vlan | 6 Comments